Bytes literal.
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 84b7232..84bd60e 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -1244,6 +1244,14 @@
 			if (c == '"' || c == '\'')
 				goto letter_quote;
 			break;
+		case 'b':
+		case 'B':
+			c = tok_nextc(tok);
+			if (c == 'r' || c == 'R')
+				c = tok_nextc(tok);
+			if (c == '"' || c == '\'')
+				goto letter_quote;
+			break;
 		}
 		while (isalnum(c) || c == '_') {
 			c = tok_nextc(tok);